Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 430 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.49 × 16 =
2. 2.46 × 18 =
3. 3.27 × 12 =
4. 4.34 × 12 =
5. 5.46 × 12 =
6. 6.36 × 14 =
7. 7.38 × 12 =
8. 8.13 × 18 =
9. 9.14 × 15 =
10. 10.17 × 14 =
11. 11.29 × 14 =
12. 12.16 × 15 =
13. 13.25 × 15 =
14. 14.47 × 18 =
15. 15.26 × 12 =
16. 16.48 × 15 =
17. 17.37 × 14 =
18. 18.17 × 15 =
19. 19.45 × 14 =
20. 20.37 × 16 =
21. 21.34 × 14 =
22. 22.29 × 12 =
23. 23.28 × 16 =
24. 24.39 × 16 =
25. 25.18 × 15 =
26. 26.38 × 18 =
27. 27.18 × 16 =
28. 28.34 × 24 =
29. 29.34 × 15 =
30. 30.15 × 18 =
31. 31.33 × 12 =
32. 32.30 × 18 =
33. 33.35 × 12 =
34. 34.22 × 16 =
35. 35.39 × 14 =
36. 36.32 × 14 =
37. 37.45 × 18 =
38. 38.46 × 24 =
39. 39.33 × 16 =
40. 40.39 × 12 =

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